Am 17.02.2011 14:22, schrieb Stephen:


> projected_through only seems to work when the light source is below the
> projected_through object. And the light is projected on the ceiling.
> Also if the light source is close in height to the object and to the
> side, the light is projected vertically upward and not through the object.
> This happens in Pov-Ray 3.5, 3.6 and RC3.
> I would appreciate it if someone would either confirm that this is


It's pretty simple: The projected_through object "sticks" to the light 
source when it is translated around.

So if you want to know where your projected_through object /really/ is, 
you'll need to use

#declare Target = box {...}
union {
   light_source {
     ...
     projected_through { Target }
   }
   object { Target no_shadow }
}

(Also note the no_shadow flag on the target.)


As another note: Are you sure projected_through really does what you 
think it does? I'm still wondering what you intend to use it for in your 
lamp scene.

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